clean-up client management.

simplified things a lot, the biggest change is that the concept
of "ClientID" is now gone, instead we simply use references.

Change-Id: Icbc57f80865884aa5f35ad0d0a0db26f19f9f7ce
diff --git a/libs/surfaceflinger/LayerDim.h b/libs/surfaceflinger/LayerDim.h
index 19a9990..f032314 100644
--- a/libs/surfaceflinger/LayerDim.h
+++ b/libs/surfaceflinger/LayerDim.h
@@ -38,7 +38,7 @@
     static int32_t sHeight;
 public:    
                 LayerDim(SurfaceFlinger* flinger, DisplayID display,
-                        const sp<Client>& client, int32_t i);
+                        const sp<Client>& client);
         virtual ~LayerDim();
 
     virtual void onDraw(const Region& clip) const;